Turbo-lag compensation system for an engine

Abstract

A boost system for an engine, comprising an engine having at least a cylinder; a fuel injector coupled to said cylinder; a compression device coupled to said engine; a compressed air storage device coupled to said compression device and configured to deliver compressed air to an air flow amplifier device located in the inlet air passageway to said cylinder; and a controller to adjust an amount of fuel injection to account for variation of air delivered to said cylinder from said flow amplifier device.

1. A boost system for an engine, comprising:
 an engine having at least a cylinder; 
 a fuel injector coupled to said cylinder; 
 a compression device coupled to said engine; 
 a compressed air storage device coupled to said compression device and configured to deliver compressed air to said cylinder through an air amplifier device; and 
 a controller to adjust an amount of fuel injection to account for variation of air mass delivered to said cylinder through said air amplifier device. 
 
   
   
     2. The system of  claim 1  wherein said air amplifier device is an air ejector assembly, used by itself or in conjunction with a turbocharger or supercharger. 
   
   
     3. The system of  claim 1  wherein said air amplifier device is an air ejector assembly, and wherein said injector is a direct injector. 
   
   
     4. The system of  claim 3  wherein said controller further adjusts an amount of said air mass delivered in response to a desired output demand. 
   
   
     5. The system of  claim 3  wherein said controller further adds at least some fuel from said direct fuel injector after intake valve closing of said cylinder to account for additional air entering said cylinder. 
   
   
     6. The system of  claim 3  wherein said controller further adjusts said amount of fuel in response to an exhaust gas oxygen sensor. 
   
   
     7. The system of  claim 6  wherein said controller varies an air flow produced by said air amplifier device in response to variation in operating conditions. 
   
   
     8. The system of  claim 3  wherein said controller determines said fuel amount in response to air flow through said air amplifier device. 
   
   
     9. The system of  claim 1  wherein said air flow delivered to said cylinder is delivered by an ejector assembly using a primary nozzle built into a valve seat. 
   
   
     10. The system of  claim 1  wherein said injector is a direct injector, and wherein said controller initiates multiple injections during a cycle of said cylinder to deliver said amount of fuel injection. 
   
   
     11. The system of  claim 10  wherein a first injection is performed at least partially during an intake stroke, and a second injection is performed after said first injection, and at least partially after intake valve closing of said cylinder. 
   
   
     12. The system of  claim 10  wherein a first injection is performed at least partially during an intake stroke, and a second injection is performed after said first injection, and at least partially during an early part of a compression stroke. 
   
   
     13. A boost system for an engine, comprising:
 an engine having at least a cylinder; 
 a fuel injector coupled to said cylinder; 
 an air amplifier device coupled into the air passageway to said cylinder; 
 a compression device coupled to said engine; 
 a compressed air storage device coupled to said compression device and configured to selectively deliver compressed air to said air amplifier device; and 
 a controller to determine an amount of air entering said cylinder during said selective delivery of said compressed air to the air amplifier and to adjust an amount of fuel injection to account for Increase of said air mass inducted into said cylinder, and thereby maintain a desired air-fuel ratio about stoichiometry. 
 
   
   
     14. The system of  claim 13  wherein said controller estimates an amount of additional fuel to add based on an air amplifier inlet pressure, engine speed, and intake manifold pressure. 
   
   
     15. The system of  claim 13  wherein timing of said selective delivery is controlled by cylinder intake valve timing and position. 
   
   
     16. The system of  claim 15  further comprising a valve seat insert, and wherein said compressed air is delivered to said insert. 
   
   
     17. The system of  claim 16  wherein said insert includes a converging-diverging nozzle. 
   
   
     18. A method for controlling engine operation of an engine having a turbocharger, a compressed air storage system coupled to said engine, said system selectively providing enhanced air flow to cylinders of the engine, the method comprising:
 during a driver tip-in event under conditions where said turbocharger is operating below a selected threshold, selectively providing said compressed air to the cylinder and adjusting a fuel injection amount to maintain a desired air-fuel ratio, where said fuel injection is delivered in at least two separate injections during a cylinder cycle at least for one cylinder cycle. 
 
   
   
     19. The method of  claim 18  wherein said engine is a gasoline engine, and wherein said compressed air is provided through an air flow amplifier system coupled to the engine. 
   
   
     20. The method of  claim 19  wherein said selective providing of compressed air is performed through a converging-diverging nozzle in a valve seat. 
   
   
     21. A boost system for an engine, comprising:
 an engine having at least a cylinder; 
 a direct fuel injector coupled to said cylinder; 
 a turbocharger device coupled to said engine; 
 a compressed air storage device coupled to said engine and configured to selectively deliver compressed air to said cylinder; 
 an air flow amplifier device coupled to the inlet air passageway to said cylinder, wherein said compressed air storage device is configured to selectively deliver compressed air through said flow amplifier device; and 
 a controller to adjust a timing of direct fuel injection when delivering compressed air to said cylinder from said compressed air storage device.